/**
 * Copyright (c) 2010 by Kevin Bierhoff.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    1. Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *    3. Neither the names of the authors nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.googlecode.syper.test.javasyp.logic;

import com.googlecode.syper.anno.Excl;
import com.googlecode.syper.anno.Old;
import com.googlecode.syper.anno.Pred;
import com.googlecode.syper.anno.ReturnExcl;

import edu.cmu.cs.crystal.annotations.FailingTest;
import edu.cmu.cs.crystal.annotations.UseAnalyses;

/**
 * @author kevin
 * @since Oct 17, 2010
 */
@FailingTest(3)
@UseAnalyses("SymbolicChecker")
public class FieldsFail {
	
	@Excl private FieldsFail next;
	private int v;
	
	static void reset(@Excl(mod = "v") FieldsFail f) {
		Pred.requires(f != null);
		f.v = 0;
	}
	
	@Excl(mod = "next")
	public void truncate() {
		@Old final int oldV = v;
		reset(this);
		// should fail because reset() modifies this.v
		Pred.ensures(v == oldV);
	}
	
	@Excl
	public void what() {
		Pred.requires(next != null & next.next != null & next.next.v == 7);
		assert next.next.v == 7;
		excl: next.doNothing();
		// succeeds: doNothing promises not to assign its receiver's fields
		assert next.next != null;
		// should fail because doNothing could do something!
		assert next.next.v == 7;
	}
	
	@Excl
	private void doNothing() {
		excl: {
			if (next != null)
				next.doNothing();
			v = 5;
		}
		Pred.ensures(v == 5 & (next == null || next.v == 5));
	}
	
	@Excl(mod = "next")
	@ReturnExcl
	public FieldsFail setNext(@Excl(borrowed = false) FieldsFail newNext) {
		excl: {
			@Excl(borrowed = false) FieldsFail result = next;
			next = newNext;
			// this is a regression that obviously this should fail
			// mutual exclusion of excl vars with others may make us think otherwise
			assert next != newNext;
			return result;
		}
	}
}
